Circuit and method for improved back electromotive force...

Details Circuit and method for improved back electromotive force... Circuit and method for improved back electromotive force...

2006-09-05

2006-09-05

Masih, Karen (Department: 2837)

Electricity: motive power systems

Switched reluctance motor commutation control

C318S132000, C318S434000, C318S599000, C318S727000

Reexamination Certificate

active

07102307

ABSTRACT:
A circuit and method provide a back EMF signal that represents a back EMF voltage induced in a coil of a brushless motor. In one embodiment of the invention, the circuit includes an input node operable to receive a tap voltage from the coil, and a network coupled to the input node and operable to generate the back EMF signal by removing a predetermined offset voltage from the tap voltage. Such a circuit provides a signal that more accurately indicates a zero crossing than existing circuits for controlling a sensorless brushless motor.

REFERENCES:
patent: 5675656 (1997-10-01), Sondermeyer et al.
patent: 6218750 (2001-04-01), Nakagawa

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